OK G Benz

I am planning on giving Mrs TimH's ML320 a clean up this weekend although it is never very dirty anyway. However, in an effort to impress, I can stress the cleanliness of the window surrounds if I do a good job (anything to get points) I really hpe that I am not going to be the butt of jokes if I really try the peanut butter trick. Are you guys SURE that it works??

99 ML320
98 Range Rover